Locking device for arc-lamp hangers.



PATENTED DEC. 25; 1906.

G.IGUTTBR.,

LOG-KING nEvxcs on ARG LAMP HANGERS.

'urzi xurnoxrnnn mm. 190s.

2 SHEETS-SHEET 1. I

THE NORRIS PETERS 00., WASHINGTON, n, c.

15:0, 839-367. 'PATENTED DEC. 25, 1906. I ,G; CUTTER;

LOGKING'DEVIGBFOR ARC LAMP HANGERS.

APPLIOAIfION FILED JUNE B OQ 1906.

11-: NORRIS PETERS 60., WASHINGTON, u. c.

.2 SHEETS-SHEET 2.

' iUNITEI) STATES ATENT OFFICE.

" I GEORGE curries, OF SOUTH BEND, INDIANA.

I 'IF-QCKINGV DEVICE 'FOR ARC-LAMP HANG'ERS- a specification.

, This invention relates to locking devices for electric-arc-lamp hangers.

.Arc-lamp hangers have in some instances been constructed of a stationary part carrying contacts and a movable part carrying contacts'adapted to be thrown into' and out of engagement with the contacts on the stationary part. The'movable part carries the lamp and isdrawn to or separated from the stationary part by means of a cable which extends to a position from which a workman may control the position of the lamp to clean the same or renew the carbons. tomary in these hangers to provide a locking device to hold the movable part against movement independentlyof the controllingcable, so that the Weight ofthe lamp will not be upon the cable when the lamp is elevated.

An object of myc'invention is to provide an improved locking device which looks and unlocks upon alternate pulls uponthe controlling-cable.

Other and further objects will appear in the following description and will be more pled together,'all parts of the hanger not bearparticularly pointed out in the appended claims;

In the drawings, Figure l'is aside elevation of the stationary and the movable parts couing upon my invention not being shown. Fig. 2 is a like view showing the movable part lowered. Fig. 3 is a detail inside view of one of the locking devices in looking position, the slot and the projection on the movable member being shown in dotted lines. Fig. 4 is a view similar to-Fig. 3, showing the effect of an upward pull upon the controlling-rope when the device is in locking position. Fig. 5 is a view similar to Figs. 3 and 4:, showing the first effect produced by releasing the rope after the parts are in the position shown in Fig. 4.. Fig. 6 is a view similar-to Figs. 3, 4, and 5,

showing the'final effect produced by releasing the controlling-rope and Figs. 7, 8, and 9 show three positions of a locking device and a pro ection upon the second upward, pull on 7 Referring more particularly to the draw- -Spcification of Letters Patent.

. Application filed June 30,1906- 1110- 324,273.

It is cus-.

Patented Dec. 25, 1906.

the tube into enlarged inverted-V-shaped recesses 2 3 indicatesthe movable member, having a pointed end 4 and suspended by a cable 5, which extends through the stationary member in the usual manner. The movable member has projecting from opposite sides a pair of'projections 6, carried by a collar 7, freely turning on the movable member.

The projections on the movable member are adapted to be engaged by a pair of looking devices, one for each projection. As these lockin devices'are duplicates of each other, it will be necessary to describe only one of them. Each locking device comprises a plate or member 8, pivoted at its upper end upon a bolt 9, which serves as the pivot for both devices. The pivot'9 is to one side of the slot 2, near the upper end thereof, and the bell-crank formation and a locking and re-.

leasing dog or trip 13, both of which are pivotally mounted intermediate of their ends and are .held in their several positions by leaf-springs 14, which frictionally bear against the sides of said dogs.

. In looking position, as shown in Fig. 3', the

pivoted plate lies obliquely across the slot 2,

and the dog 12 supports one ofthe projections 6 said dog being held in supporting position by a lug 15 on the plate and one end 16 ofthe trip 13. To release the su porting-dog 12, the cable 5 is ulled, thus e evating the projection 6 unti it engages the face 17 of the trip and moves the end 16 of the latter out of the path of the arm 18 of the dog 12. The cable 5 is now slackened and the weight of the lamp causes the projection 6 to swing the dog 12 on its pivot, and thus permit said projection to be freed and to move downwardl in a slot 2. In swinging on its pivot a shou der 19 on the dog 12 engages the lug 15 on the plate 8 and causes the plate to swing slightly on its pivot 9. passed below the dog the plate swings to its normal position, causing the dog 12 to lie After the projection 6 has across the slot. To elevate the lamp, the cable 5 is again pulled and the projection 6, engaging one arm of the dog, suddenly moves the same to holding position and then rides on the under face of the arm until it reaches the end of the arm. While the projection 6 is riding or sliding on the arm of the dog 12 the plate 8 swings on its pivot 9, and when the end of the arm is reached the projection 6 passes into engagement with the end 21 of the trip 13, causing the end 16 of said trip to pass in front of the dog 12 and lock the same against swinging. The cable is again slackened and as the projection 6 lowers in the slot it passes onto the supporting-dog, the plate 8 swinging under the action of gravity to place the dog again in proper locking position. To strengthen the stationary member,which is weakened by the vertical slots on opposite sides, I provide bars 22, each of whic connects a lower boss 10 on one side of each slot with a boss 23 on the opposite side against movement pivoted intermediate its ends to the latter part, engaged one side of its pivot by the projection to release the holding-dog and engaged by the projection on the other side of its pivot to lock the holding-dog.

2. The combination with a stationary part and a movable part, of a projection carried by one of said parts, a pivoted dog of bell-crank formation carried by the other part, and a trip pivoted intermediate its ends for holding the dog against movement and engaged alternately on opposite sides of its pivot by the projection to alternately release and lock the do 5. The combination of a tubular, stationary part provided with vertical slots on opposite sides and enlarged, inverted-V-shaped recesses at the lower ends of the slots a movable part carrying a collar adapted to turn thereon and provided with projections on opposite sides to work in the slots; and locking devices carried by the stationary part and constructed to engage the projections.

4. The combination with the stationary part provided with a vertical guide, of a movable part provided with a projection, and a locking device comprising a swinging plate normally lying across the guide, a holding dog carried by the plate, and a locking and releasing trip for the dog carried by the plate and controllable by said projection.

5. The combination with the tubular stationary part provided with a vertical slot; of

a locking device comprising a movable plate normally lying across the slot, a holding-dog on said plate, and a locking and releasing trip for the dog; and a movable part working in the stationary part and carrying a projection movable in the slot and controlling the position of the trip.

6. The combination with a stationary part provided with a vertical guide of a movable part carrying a projection; and a locking device carried by the stationary part comprising a movable part normally lying across the guide, a pivoted dog of a bell-crank formation carried by the movable part of the looking device, and a trip pivoted intermediate its ends and controlled by the projection.

.7. The combination with a tubular stationary member provided with a vertical slot; of a movable rope-controlled member; and a locking device carried by the stationary member and comprisin a pivoted plate, a pivoted holding-dog of bell-crank formation mounted on the plate, and a trip pivoted intermediate its ends to the plate and controlled by the projection.

S. The combination with a tubular stationary member provided with vertical slots on opposite sides, of a movable member carrying projections on opposite sides, a pair of pivoted plates one lymg obliquely across each slot and provided with a shoulder, a pair of bars each engaging a shoulder of each plate to limit the swinging of the plate in one direction, a pair of holding-dogs each )ivoted to a plate, a pair of leaf-springs each rictionally engaging a dog, a pair of trips each controlled by a projection for locking and releasing a dog, and a pair of leaf-springs each frictionally engaging a trip.

9. The combination with a stationary member and a movable part, of a projection carried by one of said parts, a pivoted holding-dog carried by the other part, and engaged by the projection on opposite sides of: its pivot to be moved to and from its holding position, and a trip pivoted intermediate its end, locking the holding-dog against movement in one position, and engaged 011 opposite sides of its pivot to lock and to release the holding-dog.

10. The combination with a stationary part and a movable part, of a projection carried by one of said parts, and a locking device carried by the other part and comprising a movable member, a holding-dog carried by the movable member, a trip to lock the hold ing-dog against movement, pivoted intermediate of its ends to the movable plate, engaged on one side of its pivot by the projection to release the holding-dog, and engaged on the other side of its pivot by the projection to lock the holding-dog.

11. The combination with a stationary part and a movable part, of a projection carried by one of said parts, a locking device carried by the other of said parts and comprising a movable member, a holding-dog car ried by said member, and a trip to lock the holding-dog against movement, moved into and out of engagement with the dog by being engaged bythe rojection.

12. The com ination With a stationary part and a movable part, of a (proj ection carried by one of said parts, an a locking device carried by the other of said parts and com rising a movable member, a dog of bell- I cran: formation pivoted to said member,

and a trip for holding the dog against movement pivoted intermediate of its ends and engaged alternately on opposite sides of its pivot by the projection to alternately release and lock the dog. 1

In testimony whereof I afiix my signature in presence of tWo subscribing Witnesses. GEORGE CUTTER. Witnesses: q

' GEORGE OLTSOH,

vG. M. OoLE. 

